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參數(shù)資料
| 型號： | LTC1530IS8-2.5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 301K |
| 代理商： | LTC1530IS8-2.5#PBF |
10
LTC1530
1530fa
Figure 5b plots the minimum required RIMAX resistor (k)
versus the maximum operating load current (ILMAX =
ILOAD + IRIPPLE/2) as a function of Q1’s RDS(ON). Note that
during an intial power-up sequence (VOUT = 0V), the
inductor’s start-up current IST is much higher than the
steady-state condition, ILMAX. The difference between IST
and ILMAX is affected by the input power supply slew rate,
the input and output voltages, the LTC1530 soft-start slew
rate, the maximum duty cycle and the inductor and output
capacitor values.
For a given application, the input and output requirements
are known and determine the main inductor and output
capacitor values. These values establish the transient load
recovery time. In general, a low value inductor combined
with high value output capacitance has a short transient
load recovery time at the expense of higher inductor ripple
and start-up current (IRIPPLE and IST). However, if a small
inductor and large value output capacitors are chosen, the
value of RIMAX obtained from Figure 5b may be too small
to allow proper regulator start-up.
During start-up, if IST is higher than the current limit
threshold set by the RIMAX resistor, the LTC1530 current
limit comparator turns on. This comparator then limits
input charging current by reducing duty cycle. During this
time, if VOUT doesn’t increase above one-half of the rated
value, the LTC1530 hard current limit circuit turns on. This
circuit forces the LTC1530 to repeat a soft-start cycle and
the power supply fails to start. If VOUT increases above
one-half of the rated value, the power supply output may
start-up properly depending on whether the limited input
current charges the output capacitor and prevents hard
current limit action.
Therefore, select RIMAX with the start-up current (IST) in
mind. Choosing RIMAX to set the current comparator
threshold above IST ensures proper power supply start-up
as well as recovery from an output fault condition.
Figures 6a and 6b plot the start-up IST vs output capaci-
tance and inductance for unloaded and loaded conditions
with the current limit circuit disabled. Figures 6a and 6b
are provided as examples. Actual IST under start-up con-
ditions must be measured for any application circuit so
that RIMAX can be properly chosen.
ILMAX (A)
0
MINIMUM
REQUIRED
R
IMAX
(
)
5500
4500
3500
2500
1500
500
16 18
1530 F05b
4
26
810
14
12
20
RIMAX ≥ 500
ILMAX = ILOAD + IRIPPLE/2
Q1 RDS(ON) = 0.05
0.04
0.03
0.02
0.01
Figure 5b. Minimum Required RIMAX vs ILMAX
OUTPUT CAPACITANCE (mF)
0
START-UP
I
ST
(A)
25
20
15
10
5
0
2
46
8
1530 F06a
10
12
TA = 25°C
VIN = 5V
ILOAD = 0A
L = 1.2
H
L = 4.7
H
L = 2.4
H
Figure 6a. Start-Up IST vs Output Capacitance
OUTPUT CAPACITANCE (mF)
0
START-UP
I
ST
(A)
30
25
20
15
10
5
0
2
46
8
1530 F06b
10
12
TA = 25°C
VIN = 5V
ILOAD = 10A
L = 1.2
H
L = 4.7
H
L = 2.4
H
Figure 6b. Start-Up IST vs Output Capacitance
APPLICATIO S I FOR ATIO
WU
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1530IS8-3.3 | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#PBF | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8-3.3#TRPBF | 功能描述:IC SW REG CNTRLR SYNC 3.3V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530IS8PBF | 制造商:Linear Technology 功能描述:DC-DC Controller Sync Buck 3.5-7V SOIC8 |
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